I read online about a woman who induced spawning in her denison barbs by doing a big water change with cold water from the hose, into an 80 degree tank...

So rather than matching the temp perfectly during my water change I left the temp around 70 (tank is 77)... and the barbs started swimming in small circles and chasing each other. I have never seen them do this before. Does this sound like mating behavior?

Cool! Thank you. Maybe I will try again with cool water in the future... especially once I get them in a bigger tank. Is adding cool water dangerous for any of the fish? I think cories like it but what about neons, pearl gourami or boesemani rainbowfish? is it dangerous for them?